This type of storage typically uses APIs or network requests. What is it called?

The correct answer is "Object" storage. This type of storage is characterized by its use of APIs or network requests for retrieving and managing data. Object storage organizes data as discrete units called objects, which contain the data itself, metadata, and a unique identifier. This structure allows for scalability and efficient data management, making it particularly well-suited for cloud environments.

Object storage is commonly used for unstructured data such as videos, images, backups, and big data analytics. The API-driven approach allows for easy integration with applications and services, facilitating access over HTTP and enhancing interoperability across different platforms.

In contrast, structured storage typically refers to formats like databases where data is organized in tables and columns, making it less flexible for handling varied data types. Volume storage, often associated with block storage, is used for applications requiring high performance and low latency, such as databases, but is not optimized for managing massive amounts of unstructured data. Unstructured storage, while related to the types of data that can be held (e.g., images, videos), doesn't inherently define the access method like APIs do, which is a defining characteristic of object storage. Thus, "Object" storage is the most appropriate answer.